Section 4 Chemistry Review Flashcards
Atom
The smallest form matter can exist
Element
A pure substance of only one atom type
Compound
A combination of 2 different atom types
Molecule
The smallest unit in which a compound can exist
Metal
Shinny ductile malleable good conductors solid at room temp
Non metal
Dull brittle breaks easily bad conductors gas at room temp
Solution
Different compounds that look the same but are not blood, salt water
Mixture
A combination of different compounds
Pure substance
One element throughout or molecules and compounds
Pure substance
atoms elements molecules and compounds
Mixtures
Homogeneous “look the same” blood
Heterogenous looks different trail mix
Physical change definition and Gas to liquid Liquid to solid Solid to liquid Liquid to gas Gas to solid Solid to gas
Definition: change in state
Gas to liquid condensation Liquid to solid solidification/freezing Solid to liquid melting Liquid to gas evaporation Gas to solid Solid to gas sublimation
Chemical change definition
How can you tell one happened?
Endo vs exo
Definition: reorganization of elements, breaking and making bonds
Temp color gas, odor
Endothermic is when the reaction absorbs energy “cold”
Exothermic is when the reaction gives off energy “hotter’
Chemistry history First four elements
What is alchemy
450 BC there was earth air water fire
Alchemy is trying to make other elements into gold, they discovered earth could be put into simpler elements
The periodic table
Who made it
How did he group it
Mendeleev made it
He grouped new elements by mass by comparing them to carbon
